2023广东省大湾区高三一模政治答案

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15.A【解析】首先根据C说的话可以推知,D必观看了开幕式,否则,假设D没有观看开幕式,那么C也没有观看开幕式,这与“他们之中恰有三人观看了开幕式”矛盾;其次考虑A是否观看了开幕式,假设A观看了开幕式,那么根据A说的话可以推知,B也观看了开幕式;再根据B说的话又可推知C也观看了开幕式,这样得出四个人全都观看了开幕式,不可能.因此只有A没有观看开幕式

12.B【解析】正数x,y,z满足3=4=6,令3x=4y=62=t(>1),则x=log3t,y=log4t,z=logt.对于A项,-glog,4=log,3+log,2=log,6=1故A项正确;对于B项4glogaLt4l0834=lg84,4=64÷<81+=3,则3=10g4<1og;3=1,所以3x<4y,同理4y<6z,所以3x<4y<6z,故B项错误;对于D项,由1=1+1元N2y,两边平方整理可得xy>2z2,故D项正确;对于C项,由D项知xy>2x2,可得x+y>2√xy>2√2z2=22z>(2+2)x故C项正确,故选B项

5.D【解析】3cosC=4sinA,∴由正弦定理可得3sinAcosO=4sinCsinA:sinA≠0,:3osC=4sinC,即cosC=4inC∴sinC+cos2C=sin2C+16sim2C=25sinC=1,解得snC=3或sinC=-3(舍去),b=4,△ABC的面积S=10=absinC=×a×4X…∴解得a=.故选D

17.解:(1)当a=1时,B-(1,2),则CB=(-∞,-1]U[2,+∞)而A=[2,6]则(CB)∩A=[-2,-1∪[2,6(5分)(2)当a=0时,B=C,符合题意;当a≠0时,因为B=A,所以当a>0时,B=(a,2a),只需2a≤6,即a≤3,又a>0,所以0

5.B【解题分析】当=1000时,C=Wlog21000,当4000时,C=Wlog24000,因为:0010823012所以将信噪比从100提升至400,则C大约增加了20%

第一节短文改错(共10小题;每小题1分,满分10分)One day, my Spanish teacher asked if I could stay after class for a minute, that got me nervous asI thought I was in the trouble for something. It turned out she saw my paperwork and realize I was on the③3 realizedboard of the Key club. She told me that her son, Abraham, was autistic(自闭症的) but his doctorhad suggested he join a service club to help with her socialization. She asked if it would be impossiblefor me to speak with the rest of the board of letting abraham joinI immediately said I would, and the rest of the board enthusiastic about Abraham: at any activitywe did they all encouraged him, sat with him, and chatted with him, made sure he was having thebest time. It was real beautiful to seereally